concessive

/kənˈsɛsɪv/

adjective

1.

implying or involving concession; tending to concede

2.

(grammar) a conjunction, preposition, phrase, or clause describing a state of affairs that might have been expected to rule out what is described in the main clause but in fact does not: "Although" in the sentence "Although they had been warned, they refused to take care" is a concessive conjunction